Families of hostages were informed that the process of releasing their loved ones will begin on Monday morning, according to a letter sent to the families provided to ABC News by a senior Israeli Official on Sunday.

"The preparations for the absorption of the living kidnapped in the Gaza Strip, in the Re'im camp, in the hospitals, and in general in the government systems have been completed," the letter reviewed by ABC News said.

It added, "The preparations for the absorption of the deceased kidnapped have been completed, and they will be transferred in a respectful manner, in accordance with the appropriate procedure, to the Institute of Forensic Medicine to carry out the identification process."

-ABC News’ Ian Pannell, Jordana Miller and Somayeh Malekian

Egypt is scheduled to host an international peace summit in the Red Sea town of Sharm El-Sheikh on Monday, co-chaired by Egyptian President Abdel Fattah El-Sisi and U.S. President Donald Trump, the spokesman of Egyptian Presidency said in a statement on his official Facebook account late Saturday.

The gathering will be attended by leaders from more than 20 countries, the statement said.

The summit aims "to end the war in the Gaza Strip, enhance efforts to achieve peace and stability in the Middle East, and usher in a new era of regional security and stability," according to the statement.

The Egyptian presidency said the meeting is part of "Trump’s vision to achieve peace in the region."

-ABC News’ Somayeh Malekian and Ayat Al-Tawy

Ivanka Trump, Jared Kushner and Steve Witkoff, United States special envoy to the Middle East, spoke at a rally Saturday at the Tel Aviv plaza known as "Hostages Square."

Their remarks about the proposed ceasefire come just a day before President Donald Trump is scheduled to visit Israel amid Hamas' expected release of the hostages as agreed upon under the deal.

Ivanka, during her brief remarks, shared a message from her father, claiming, "He stands with you always."

"And the president wanted me to share, as he has with so many of you personally, that he sees you, he hears you, he stands with you always. Always," Ivanka Trump said, whose comment were met with cheers of "Thank you, Trump" from the crowd.

Witkoff kicked off the address, calling for "peace, unity and hope."

He added that "miracles can happen -- peace born not out of politics, but out of courage, the courage of those who refuse to give up hope."

Kushner warned against a premature celebration of the hostages being released.

"We're not going to celebrate tonight. We're going to celebrate on Monday when phase one gets into conclusion," Kushner said.

-ABC News' Isabella Murray

The death toll in Gaza has risen by 151 in the last 24 hours, according to the Gaza Health Ministry.

The majority of the bodies recovered were from areas that were not safe for rescue crews to reach before the ceasefire.

"A number of victims remain under the rubble and on the roads, as ambulance and civil defense crews are unable to reach them at this time," the health ministry said.

-ABC News' Victoria Beaule

Egyptian President Abdel Fattah El-Sisi spoke by phone with U.S. President Donald Trump on Thursday and invited him to attend a planned ceremony in Egypt marking the signing of a Israel-Hamas ceasefire agreement.

“President El-Sisi extended an invitation to President Trump to participate in a ceremony to be held in Egypt to mark concluding the ceasefire agreement in the Gaza Strip, considering it a historic agreement that crowns the joint efforts of Egypt, the United States, and the mediators over the past period,” a statement from the Egyptian President’s office after the call said.

Sisi said reaching an agreement was a “historic achievement,” and said Trump “deserves to receive the Nobel Peace Prize,” the statement added.

The date and time of the planned ceremony to sign the ceasefire deal were not immediately clear.

Trump said Thursday that he agreed to speak before the Israeli Knesset.

-ABC News' Ayat Al-Tawy